Mold for casting metal bars



C. G. HEIBY, 1. BURKAM, D. E. LINDQUIST, F. L. RKGGIN, E. W. ALLEN AND R. LAU.

MOLD FOR CASTING METAL BARS.

APPL'ICATION FILED JAN. 17, I-9l8.' y

)atented Feb. 24,1920.

4UNITED sTATEs PATENT OFFICE.

EARL Gr. HEIBY, JOHN BURKAM, k:DAVID E. LINDQUIST, FRED L. RIGGIN, EBENEZER W.

ALLEN, AND RICHARD LAU, OF SARNIA, CANADA, ASSIGNORS, BY MESNE ASSIGN- MENTS, TO MUELLER METALS COMPANY, 0F PORT HURON, MllCHIGAN, A. CORPORA- TION OF MICHIGAN.

MOLD FOR'CAS'ING METAL BARS.

Application filed January 17, 1918.

To all l'whom t may concern.'

Be it known that we, CARL G. HEiBY, JOHN BURKAM, Davie E. LINDQUIST, EBE- NEZER W7. ALLEN, FRED L. RIGGIN, and RIGH- Akn LAU, all 't Sirens of the United States eX- cept ALLEN, e; subject of Great Britain, r siding at Sarnia, in the county of Lambton and Dominion of Canada, have invented new and useful Improvements in Molds for Cast- Stock for forging must be free from faults, such as blow holes, pipes, and'dross llings, for the reason that not only will such faults appear under the action of the press, but also where such forgings are afterward machined subsurface faults may be developed. Such faults result in much stock that cannot be used, and many of the forgings, both before and after machining, are so faulty as to be rejected, with the consequent loss of material and labor. Furthermore, faults not apparent after forging or machining may develop in use, necessitating the removal of the defective article and its replacement by a sound one.

This has been so serious a diticulty that much ofthe stock is produced by the eX- pensive method of rolling, so as to eliminate the objectionable porosities which, as stated,

- are common in castings made under present methods.

With the apparatus herein disclosed it is possible to produce stock free from the faults named, and equal to the rolled stock, expeditiously and cheaply, so that finished articles may be turned out in large numbers and at a relatively low cost, with practically no loss from rejected stock or finished goods.

While the stock produced may, of course, be utilized for any purpose, the present embodiment of the invention discloses the manufacture of stocks designed more particularly for the rapid and economical production of fuse bodies for shells, which must, first, be of high grade material to insure efficiency and safety, and second, must be produced economically and expeditiously.

In the drawings herewith is shown one Specification of Letters Patent.

Patented Feb. 24.-, 1920.

Serial No. 212,224.

physical embodiment of the apparatus and by which the method may be practised, and in said drawings:

Figure 1 is a longitudinal sectional view of molding apparatus made in accordance with this invention;

Fig. 2 is a top plan view of the apparatus shown in Fig. l;

Fig. 3 is a section transversely of the apparatus on substantially the line 3 3 of Fig. 1, looking in the direction of the arrow;

Fig. 1 is a view similar to that shown in Fig. 3 with the mold or chill open;

Fig. 5 is a perspective view of the clamp and wedge block for clamping the upper and lower parts of the chill.

Referring to the drawings b numbers, the same numbers indicating li te parts in the several views, 10 indicates the lower half of a mold or chill, which is channeled or grooved to the particular shape in crosssection of the stock to be produced. The

chill member 10 is mounted on any suitable support, as for example blocks 11.

Seated upon said chill member 10, and for convenience hinged thereto, is a complementary upper chill member 12, gr'ooved to coincide with the groove in the member 10, so that when the parts are closed a proper mold cavity is formed.

The two members 10 and 12 may be suitably clamped together by U-clamps 13 and wedges l1, as shown, or by any usual and readily removable device.-

The member 10 is preferably extended as at 15 and somewhat thickened, a chamber 16 being formed in such extension, the b0ttom of which is below the bottom of the groove in the lower member 10, while the upper surface of the extension 15, which forms a seat for a sprue block 17 is in a plane below the top of the groove in member 12. Mounted upon the extension 15 is the sprue block 17. which is preferably made in two `half-portions, as shown, so as to form a vertical channel delivering to the chamber 16 heretofore described. 4

The chamber 16 is preferably provided with a curved bottom which slopes easily to the bottom of the mold cavity in the chill. The said sprue block members are held together by any suitable means, as a screwcla-mp 18, and are clamped tightly to the seat formed by the extension 15 by a clamp 19 which may be tightened by wedge blocks 20. i

Preferably the sprue hole formed by the lvertical members of the block 17 which constitutes a mold-supplying container is coned or tapered from the bottom upwardly, so

as to give freedom of flow to the chamber member 12 with good results, the purposev of this vent orifice being to permit the ready escape and venting of gases from the mold interior as the molten metal flows into the mold. The venting means herein shown as a slot 22, has the further advantage that when the metal is oured, the slot 22 will receive an excess o or casting begins to Set or freeze, and by 4reason of such freezing, shrink or contract,

this excess metal which. Hows upwardly into the slot 22 will collapse into the bar and supply a small excess of metal to insure a full sized and solid casting without leaving any objectionable fin or projection along the line of the slot.

As has been stated the chill members 10 and 12 are clamped b the U-members 13 and wedges 14, and i the venting means consists of the slot 22 extending the full length of the chill member 12, as shown in the present illustration', the wedges 14 will preferably be formed as shown, slitted and grooved so as not to interrupt the continuity of the slot 22, and prevent free venting.

With the parts disposed as shown and described, it will be seen that a chill is provided in which a closed molding cavity is provided to which the m-etal is delivered from a pool collected in an enlarged chamber at the receiving end of the chill'cavity. Flow from the chamber to the mold cavity is through the somewhat restricted passage formed by the lower end 0f the vertical sprue block, which lower end serves to dam and hold back dross and floating impurities and prevent their passing into the mold cavity. A s the molten metal is poured into the sprue 1t will, of course, fall to the bottom of the chill-supplying chamber and the flow l will be from the bottom of the pool along thesloping surface leading into the mold cavity, so that pure metal only will be delivered. By maintaining an excess of metal metal, and as the bar in the container so that the height of the poured metal in the chamber and sprue hole will be above the level of the passage leading to the chill cavity, all dross or other impurities are skimmed back and held in the vertical sprue holeso that their passage to the mold is impossible.

If desired the end of the chill may be stopped Iby a plug 21 which is placed at any desired point longitudinally of the mold cavity and will be securely lheld when the chill members are clamped together.

When the run has been made and the metal has set and cooled the chill parts will be unclamped and separated and the casting removed. It will be of the form shown as filling the mold cavity in Fig. 1, with a body 'portion of pure dense metal free from faults,

at the sprue end of which will be the vertical portion formed by the sprue block. The relatively small vertical portion will contain those impurities which have been skimmed back and prevented from entering the mold, and may be readily separated at the relatively thin section by which it is joined to the main casting.

We claim:

1. A mold comprising a plurality of horizontall separable chill members, one of which 1s provided with a venting orifice and the other of which has a chambered extension, a sprue block formed of a plurality of vertically separable members mounted on said extension and in communication with said chill members, said sprue block forming therewith arestricted passage from said chamber to said mold. l

2. In a mold, a plurality of horizontally separable chill members, the upper one of which has a venting orifice, means for clamping said members together, a-nextension on the lower one of said chill/members having a chamber extending below the bottom of the mold, a sprue block formed of a plurality of vertically separable members seated on said extension and forming therewith a restricted passage from said chamber to said-mold, means for clamping said sprue block member together, and means for clamping said members to the chill extension.

3. In a mold` a lower chill member, an upper chill 'member hinged thereto and having a venting'orice. an extension on the lower chill member having a. chamber extending below the bottom of the mold, means for clamping said hinged members together, a

sprue block formed of a plurality of members mounted on said extension and forming with said extension a restricted passage'to said mold, means for clamping said block membeis together, and means for clamping said sprue block to its seat.

4. In a mold, separable chill members, one of said members having a venting orifice,

clamps for holding said members to ether, and Wedges for seating said clamps `iaving openings coinciding With the venting orifice.

5. In a mold, a'lower chill member, an upper chill member having a Venting slot therein, clamps for holding said chillimembers together, and Wedges for seating said clamps having grooves and openings therev in coinciding with the Venting slot insaid upper chill member.

6. A moldcomprisin'g a plurality of horizontally separable chill members, one of which is providedwith a ventin orifice and the other of which has .a chami red extension, a sprue block formed of a plurality of 15 In testimony whereof we have hereunto 20 set our hands.

CARL G. HEIBY.

JOHN BURKAM.'

DAVID E. LINDQUIST. FRED L. RIGGIN. EBENEZER W. ALLEN. RICHARD LAU. 

